Unit Test — Unit test

Question 1

Luke pulls a sled using a force of 65 N for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25° with the ground.

Revolt · Accepted Answer

1,500 J

Question 2

A spring that has a spring constant of 1400 N/m is stretched to a length of 2.5 m. If the normal length of the spring is 1.0 m, how much elastic potential energy is stored in the spring?

Revolt · Accepted Answer

1575 J

Question 3

10152530

Revolt · Accepted Answer

15

Question 4

Which energy transformation occurs after a skydiver reaches terminal velocity?

Revolt · Accepted Answer

Gravitational potential energy transforms into thermal energy.

Question 5

To do work, this truck uses energy stored in chemical fuel and an electrical battery.

Revolt · Accepted Answer

800 J

Question 6

Earth and all of the air in the atmosphere around it make up an incredibly complex system. Energy is constantly changing forms in many different ways.

Revolt · Accepted Answer

Earth is an open system because heat energy from the Sun enters through the atmosphere.

Question 7

Which energy transformations occur in this case? Check all that apply.

Revolt · Accepted Answer

Some of the potential energy of the feather is converted into kinetic energy.; Some of the rocks’ potential energy is converted into thermal energy due to the friction of air resistance.; Some of the feather’s potential energy is converted into thermal energy due to the friction of air resistance.

Question 8

Four landing sites are proposed for a lander. Data about the sites are listed in the table.

Revolt · Accepted Answer

X

Question 9

A 60.0 kg object is moving east at 8.00 m/s, and then slows down to 4.00 m/s. How much work was done?

Revolt · Accepted Answer

–1,440 J

Question 10

What is the formula for calculating kinetic energy?

Revolt · Accepted Answer

KE = mv2

Unit Test — Unit test Answers

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